// 
// AssumeBlock.cs
// 
// Authors:
// 	Alexander Chebaturkin (chebaturkin@gmail.com)
// 
// Copyright (C) 2011 Alexander Chebaturkin
// 
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//  
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// 

using Mono.CodeContracts.Static.ControlFlow.Subroutines;
using Mono.CodeContracts.Static.DataStructures;

namespace Mono.CodeContracts.Static.ControlFlow.Blocks {
	class AssumeBlock<Label> : BlockWithLabels<Label> {
		protected readonly Label BranchLabel;
		protected readonly EdgeTag Tag;

		public AssumeBlock (SubroutineBase<Label> subroutine, Label label, EdgeTag tag, ref int idGen)
			: base (subroutine, ref idGen)
		{
			this.BranchLabel = label;
			this.Tag = tag;
		}

		public override int Count
		{
			get { return 1; }
		}

		public override Result ForwardDecode<Data, Result, Visitor> (APC pc, Visitor visitor, Data data)
		{
			if (pc.Index == 0)
				return visitor.Assume (pc, this.Tag, Dummy.Value, data);

			return visitor.Nop (pc, data);
		}
	}
}